Concrete wall form extension bracket



Aug. 1, 1961 G. F. BowDl-:N

CONCRETE WALL FORM EXTENSION BRACKET 4 Sheets-Sheet 1 Filed Aug. 9, 1960INVENTOR. Gemeaz F. Bawpeu Aug. 1, 1961 G. F. BowDEN CONCRETE WALL FORMEXTENSION BRACKET 4 Sheets Sheet 2 Filed Aug. 9] 1960 ww f a INVENTOR-GEoRGE F. BawoEN Aug. 1, 1961 G. F. BowDEN 2,994,120

CNCRETE WALL FORM EXTENSION BRACKET Filed Aug. 9, 1960 4 Sheets-Shee'l'l3 Eig:

32 INVENTOR. 31 Geo RGE F. Bowoc-:N

35 WMM ATTY.

Augl, 1951 G. F. BowDEN CONCRETE WALL FORM EXTENSION BRACKET 4Sheets-Shea?I 4 Filed Aug. 9, 1960 Z Z l INVENTOR. GEORGE F. BowosNUnited States Patent 2 994,120 CONCRETE WALL FRM 'EXTENSIN BRACKETGeorge F. Bowden, Des Plaines, lll., assigner to Symons Clamp & Mfg.Co., Chicago, Ill., a corporation of Delaware Filed Aug. 9, 1960, Ser.No. 48,468 6 Claims. (Cl. 2'5-131) The present invention Irelates toconcrete wall forms of the panel type wherein the opposed wall forms areeach constructed of a group of rectangular panels assembled inedge-to-edge relationship, with the wet concrete being poured into thespace existing between the walls, and with the two walls being connectedby combinedtie and spreader devices to prevent the walls from bulgingunder the thrust of the wet concrete. The panels commonly employed intype of concrete wall form consist of facings of plywood against whichthe wet concrete lies, and stiening and strengthening frames which areapplied to the outer sides of the facings. Such strengthening framesinclude marginal horizontal and vertical members and intermediatecrossbars -which may extend either vertically or horizontally and whichare connected at their ends to either the horizontal or the verticalmarginal frame members. The present invention has particular referenceto concrete wall forms of this sort but which are known as prcfabricatedwall forms in that the individual panels are assembled at the factoryrather than in the field, and in that the plywood .panel-reinforcingmembers, including the vertical and horizontal marginal Qmembers and anyintermediate cross members which may be employed, are in the 'form oflengths of steel channel or angle stock which may 'be rolled to specialshape and perforated, notched, grooved or otherwise fashioned toproperly receive therein the plywood panel edges, as well as tofacilitate the use of suitable fastening devices or other concrete formhardware whereby the adjacent panel units may be fastened together.

Specifically, 'the present invention is concerned with a novel form ofextension which is capable of use in numerous ways to effect extensionof a wall form which is made up of prefabricated panel units of thecharacter briey outlined above.

I-n the erection of certain concrete structures, situations frequentlyarise wherein accommodations must be made for a projecting object whichextends outwardly from the surface of the concrete structure. Forexample, a water pipe or other conduit'may extend laterally from thesurface of va concrete wall undergoing formation, thus interfering withthe normal installation of one or more of the regular prefabricatedpanels employed for the installation. Such panels are manufactured instandard sizes and they are designed with a view toward repeated usethereof. Thus, to modify a standard panel unit, for example by cutting ahole in the plywood facing thereof to accommodate the pipe or otherprojection would be to render the unit unit for subsequent use.

Other situations may arise wherein, in order to accommodate a specificdimension, an undersize panel is required with a facing which may eitherbe imperforate or which may be cut away to accommodate a projection. Thecost of producing a modiiied panel unit for such a purpose is relativelyhigh in that it involves the use of skilled labor in cutting and ttingone or more plywood facings associated with the unit or units. -ln suchinstances it is unlikely that such modified undersine panel units willfind `further use beyond that for which they are designed.

Still further, in the erection of certain concrete structures,situations frequently arise where the height of a given installation isnot an exact multiple in units of length, of the available prefabricated`form panels at the scene of installation. In other Words, nocombination of available panels (which invariably are manufactured instandard sizes) can lbe selected to build up a wall form structureexactly equal to the desired concrete wall height. Occasions also arisesin the ield where it is necessary to provide upward extensions ofagiven-wall installation, either at the time the concrete is initiallypoured, or after the poured concrete has hardened so that a secondibring the level of the concrete above the top level of the firstconcrete pouring. In instances where Prefabricated wall panels areemployed, it lis inconvenient to add to the wall form by the -use ofadditional full Iheight panels to accommodate afew inches increase inthe form height.

According to the presentinvention, when a situation such as those which--have briey been outlined above arises, the use of a small temporarylform is contemplated, the [form useful in that area of theinstall-ation which, otherwise, would require the use of one or moreregular but modified panel units. The invention thus provides arelatively simple and inexpensive wall form extension whereby theoriginal wall form, consisting entirely of full width and heightprefabricated panel units, may be extended either horizontallyor-vertically to the desired degree without necessitating the useoffu-ll sizev Prefabricated panel and utilizing' a minimum ofYhorizontal marginal'frame members of a panel unit, or

of adjacent panel such. bracket having means associated therewithwhereby a wooden plank or board, or

a specially constructed temporary panel facing. of the.

necessary length may be conveniently attached to the bracket in accurateedge-toedge relationship with the adjacent panel unit or units, eitherto extend the height of a given installation, to extend its width, or tolill in a vertical or horizontal distance between adjacent panelfacings.

Another object of the invention is to provide an extension bracket ofIthis character which will enable the extension board or panel to liewith the inside face thereof `accurately aligned in the plane of theinside faces of the adjacent panel unit or units.

It is a. further object of the invention to provide such an extensionbracket having means associated therewith whereby opposed `braclzets onopposite sides of the form structure may be tied together byconventional tie rod structures.

Another object of the invention is to provide an extension bracket whichis so designed that it may be applied to the marginal frame members ofthe adjacent panelunit or uni-ts, utilizing only conventional concretewall form hardware so that, lapart from the fabrication of the bracketitself, no special manufacturing operations are required.

Yet another object of the invention, in an extension bracket of thischaracter, is to provide means for accommodating the attachment 'theretoof alignment walers, such means embodying only conventionalwaler-clamping hardware. 1

Finally, it is a further object of the invention -to provide anextension bracket which is capable of independent removal from any giveninstallati-on, regardless of its manner of use, i.e. of whether it beemployed as a terminal vertical or horizontal extension member or as afill-in extension member.

The provision of an extension bracket which is of one piece constructionand which may readily be manufactured as a metal stamping; one which isinherently reinforced against lateral and torsional stresses; one whichis rugged and durable and which therefore will withstand rough usage;one which is capable of repeated use; and one which, otherwise, is welladapted to perform the services required of it, are further desideratawhich have been borne in mind in the production and development of thepresent invention.

Other objects and advantages of the invention, not at this timeenumerated, will become more readily apparent as the nature of vtheinvention is better understood.

In the accompanying four sheets of drawings forming a part of thisspecification, one illustrative embodiment of the invention has beenshown in several different environments.

In these drawings:

FIG. l is a fragmentary perspective view of one side of a concrete wallform, showing a plurality of extension brackets constructed inaccordance with the principles of the present invention operativelyapplied to Ia horizontal ll-in form extension assembly;

FIG. 2 is a fragmentary perspective view similar to FIG. 1 showing apair of the extension brackets operatively applied to the upper edge ofone side of a concrete wall form for form extension purposes;

FIG. 3 is a fragmentary perspective view similar to FIG. 2 showing apair of walers operatively applied to one of the extension brackets;

FIG. 4 Iis an enlarged perspective view of one of the improved extensionbrackets of the present invention;

FIG 4a lis a transverse section on the line 4a-4a of FIG. 4;

FIG. 5 is an enlarged sectional view taken substantially on thehorizontal plane indicated by the line 5 5 of FIG. 1 in the directionindicated by the arrows;

FIG. 6 is an enlarged sectional view taken substantially on thehorizontal plane indicated by the line 6--6 of FIG. 1 in the directionindicated by lthe arrows;

FIG. 7 is a fragmentary side elevational view of a portion of thestructure shown in FIG. l;

FIG. 8 is an enlarged fragmentary perspective view, partly in section,of a portion of the installation shown in FIG. 2, the fragment beingtaken in the vicinity of the juncture -between an extension bracket andone of the wall form panels;

FIG. 9 is -a fragmentary side elevational view of a portion of thestructure shown in FIG. 8;

FIG. 10 is a sectional view taken substantially along the line 10-10 ofFIG. 2;

FIG. 11 is an enlarged perspective view of a portion of the structureshown in FIG. 2 and illustrating the manner in which a pair ofoppositely disposed extension brackets may be connected together by atie rod assembly;

FIG. 12 is an enlarged fragmentary perspective view, partly rin section,of a port-ion of the structure shown in FIG. 3; and

FIG. 13 is ra vertical sectional view of the structure shown in FIGS. 3and 12.

vReferring now to the drawings in detail and in particular to FIG. 1, afragmentary portion of one side of a composite wall form of theprefabricated metal-reinforced panel -type has been illustrated hereinand designated in its entirety at 10. The wall form is made up of aseries of rectangular panel assemblies, only three of which have beenfragmentarily shown herein at 12, 14 and 16, with the panels 14 and 16being arranged in edge-to-edge relationship and with the panels 12 and14 being laterally spaced from each other, the space existing betweenthese latter two panel units being filled in so to speak, or bridged bythe form extension assembly of the present invention.

Each panel un-it is in the form of a generally rectangular plywoodfacing 18 having a marginal reinforcing frame'applied to the outer faceof the panel unit and consisting of vertical and horizontal marginalframe bars 20 and 22, only the upper frame bar 22 of each panel unitbeing shown herein. The bars 20 extend in contiguity at Athe juncturebetween the panel units 14 and 16, while the adjacent or opposed bars 20associated with the panel units 12 and 14 remain spaced from each other.It will be understood that the wall form side 10 is arranged in spacedopposition to a similar wall side and is maintained in spacedrelationship from such wall side by means of conventional .tie rod andspreader devices, fragments of which have been illustrated herein landdesignated in their entirety at 24. Intermediate horizontal framemembers 26 extend across each panel unit and such members have theirends secured by welding to the opposed faces of the two verticalmarginal frame bars 20.

The vertical frame bars 20 are of shallow channel shape in cross sectionand each =bar includes inside Iand outside marginal ribs or tlanges 30and 32 respectively (FIGS. 5 and 6), and a connecting web portion 34. Alateral flange 35 spaced inwardly a slight distance from the inside edgeof each frame -bar affords a right angle recess 36 in which the adjacentvertical edge of the plywood facing 18 or panel proper seats with itsinside face extending ush with the inside edge of the frame bars 2G and22.

In erecting the concrete wall form 10, .the two panel units -14 and 16are brought into contiguity with adjacent vertical frame bars 20abutting each other so that the respective ribs 30 and 32 are inedge-to-edge abutting relationship while the web portions 34 remainslightly separated. At vertically spaced regions along the marginal ribs30 and 32, pairs of transversely registering notches 42 are provided andthese notches, when the frame bars are in contiguity, delinetherebetween horizontal channel voids adapted to receive therethroughthe tie rods proper of the tie rod and spreader assemblies 24. Arectangular slot 46 is formed in the web portion 34 at t-hc horizontallevel of each pair of notches 42 and is adapted to receive therethroughthe usual T-bolt and wedge assembly devices 48 whereby the frame bars 22may be drawn tightly together.

The horizontal frame bars 22 are substantially identical in theirconstruction to the vertical frame bars 20 and, to avoid needlessrepetition of description, similar reference characters have beenapplied to the corresponding parts of both frame bars.

The arrangement of parts thus far described is purely conventional inits design and construction and no claim is made herein to any noveltyassociated with the same. Concerte walls of this type may vary widely intheir details ofconstruction and it will be understood that the wallform illustrated herein is purely exemplary of one embodiment of aconcrete wall form to which the form,

extension of the present invention is applicable. Only such portions ofthe wall form 10 as are operatively associated with, or bear a relationto, the present wall form extension have been illustrated herein.

Panel uni-ts of the type set forth above are generally made in standardsizes and occasionally a situation will arise where a pipe or other typeof projection must be accommodated by the wall form at the point wherethe object protrudes from the wall or other structure. To

cut through the plywood panel of a full size panel unit would entailboth the cost of labor involved and the cost of the lumber which wouldthus be rendered unlit for subsequent reuse. The present invention, inthe environment in which it is illustrated in FIGS. l, 5, 6 and 7,precludes the necessity of modifying and using standard panel units inthis manner and, accordingly, it contemplates the provision of aplurality of form extension brackets which have been designated in theirentirety at 50, three such brackets appearing in FIG. 1 and one of thebrackets per se being shown in detail in FIGS. 4 and 4a.

Each extension bracket is in the form of an elongated sheet metalstamping of relatively heavy gauge, for example sheet metalapproximately one-eighth inch in thickness, and which is generallyU-shaped in transverse crosssection with lateral coplanar attachmentanges at the free edges or extremities of the side legs. The sides 52and 54 of the bracket 50 are substantially fiat and they are slightlydivergent While the bight portion 56 which connects the sides is arcuatein cross section. Lateral flanges S8 and 60 are coplanar and each isprovided with a series of nail-receiving holes 62 therethrough. In thebight portion 56 at the medial region thereof, there is formed anelongated slot 64, the axis of which extends longitudinally of thebracket as a whole. In transverse register with the slot 64, each side52 and 54 is formed with a slot 66, the axis of which extendstransversely of the side or, stated otherwise, at a right angle to theaxis of the slot 64. A-t each end of the bight portion 56, the metalthereof is relieved to provide a shallow end notch 68. Near the ends ofthe bracket 50, the sides 52 and 54 are provided with transverselyaligned slots 69, the axes of which extend longitudinally of thebracket. The purpose and function of the various slots 64, 66, 69, andof the notch 68, as well as of the holes 62 will become clear presently.

'Ihe nail holes 62 are provided for the purpose of facilitating nailingof the attachment brackets 50 to one orV more extension facing boardssuch as the board 70 shown in FIG. 1. The board 70 is shown herein asbeing ,formed with the necessary clearance region to accommodate anyprotruding object such as a pipe or the like which may project outwardlyfrom the finished concrete jwall structure. I The extension brackets 50are employed in the environment shown in FIG. 1 for the purpose ofmaintaining the board 70 in position between the adjacent panel units 12"and 14 with the inside surface of the boards ush with the plywood panelfacings 18 and, accordingly, the brackets are installed between -theopposed adjacent vertical frame bars 20. Installation of the brackets ismade by aligning the ends of each bracket with the opposed slots v46 inadjacent vertical marginal members 20 with the Qcommon plane of thelateral anges 58 and 60 extending vertically and with the angespresented inwardly of the form. The shallow end notches 68 of thebracket 50 alord clearance regions so that the bight portion 56 mayoverlie the adjacent rib 32 (see FIGS. 5 and 6) and permit the end edgesof the bracket to lie iush with the outer surface of the web portion 34of the vertical member 20. With the bracket thus in position between theadjacent vertical members 20, conventional T-bolts 74 are installed inthe aligned slits 46 by passing the shank portions 76 thereof throughthe slots so that the heads 78 of the bolts bear against the webs 34,after which wedges 80 are passed through the adjacent aligned slots 69in the bracket sides 58 and 60 and through the slots 82 provided in theshank portions 76 to thus draw the ends of the brackets hard against theweb portions 34 and securely maintain the brackets in position betweenthe adjacent frame bars 20.

After the brackets 50 have been thus anchored between the opposedvertical frame bars 20, the extension board 70 is brought squarelyagainst the inside faces of the lateral anges 58 and 60 of the variousbrackets 50 and the flanges are nailed to the board, utilizing dual headnails 83 which are passed through the nail holes 62 as best seen inFIGS. 5, 6 and 7. It is to be noted that the distance between the planeof the lateral flanges 58 and 60 of each bracket 50 and the inside edgesof the adjacent frame bars 20 is precisely equal to the thickness of theextension board 70 so that the board will, when nailed in positionagainst the anges, lie flush with the various panel facings 18 andpresent a uniform and unbroken extension of these facings.

In FIG. 2, a pair of the extension brackets 50 are shown as beingoperatively mounted on the upper horizontal marginal frame bars 22 ofadjacent panel units 14 and 16 for the purpose of providing an upwardextension of the wall form. Occasionally, in the field, a situation Willarise where the height of a particular concrete wall structure to beerected exceeds by a manner of inches, say from four to twelve inches,the height of a wall form which can be built up by the use of standardheight panel units. While it would be possible to utilize an additionalpair or pairs of panel units of minimum standard height in opposedrelationship on opposite sides of the form, the use of such units wouldnot only entail the cost of the units and their attendant concrete formhardware for fastening them in place and for spacing them across theform, but it would also preclude the use of screed devices at the topofthe form. The present invention obviates the use of additional panelunits in this manner, and, towardthis end, it contemplates the use of aplurality of the form extension brackets 50 in the environment in whichthey have been illustrated in FIGS. 2, 8, 9 and l0.

In FIG. 2, the panel units 12, 14 and 16 remain the same as described inconnection with the form installation of FIG. l, with the exception thatthe panel units 12 and 14 are not separated and are secured together incontiguity and edge-to-edge relationship by conventional bolt and wedgeassemblies 48. The lbrackets 50 extend vertically and the lower endedges thereof seat squarely on the web portion 34 of the upper framebars 22 as best seen -in FIG. 8 and in register with respective slots46. The clearance notches 68 overlie the outer raised rib 32 of theframe bar 22. The lower ends of fthe brackets 50 are held in position onthe frame -bars 22 by the use of T-bolts 74 which are passed upwardlyVthrough the adjacent slots slots 46 and which are anchored in positionby wedges which are passed through the aligned slots 69 and 82 in thebrackets and T-bolts respectively. The manner of securing the lower endsof the brackets 50 to the horizontal frame bars 22 is identical with themanner of securing the ends of the brackets to the vertical frame bars2050 that further description is unnecessary.

With the brackets 50 in position on the upper frame bars 22, anextension board, or boards, such as the one shown at are broughtsquarely against the inside faces of the lateral flanges 58 and 60 andthe anges are nailed to the boa-rd by dual head nails 83 as previouslydescribed in connection with the extension board 70 of FIG. 1. Thedistance between 'the planes of the flanges 58 and 60 and the insideedge of the adjacent frame bar 22 is precisely equal to the thickness ofthe extension board 90 so that the inside face of the board will lie ushwith the inside faces of the various panel facings 18 and present auniform unbroken extension-f the llatter, the intervening inside edgesof the frame bars 22 serving to preserve the facing continuity.

The various medial slots 66 may be employed for tie rod attachmentpurposes or, alternatively, they may be employed in combination with theadjacent slots 64 for waler anchoring purposes, thislatter use beingillustrated in FIGS. 3, 12 and 13 in a manner that win be describedsubsequently. Preferably, the upper free ends of the extension brackets50 are employed for tie rod attachment purposes as shown in FIGS. 2 andl1. The connection at each end of the tie rod is made by passing thelooped end 102 of the rod around the slotted shank portion 104 of aT-bolt 106 so that the head portion 108 of the bolt rests upon the loop.Thereafter a Wedge 110 is passed through the aligned slots 69 in thesides 58 and 60 of the U-shaped bracket and through the slot 112 -in theshank portion 104 of the bolt 106.

Where a waler or dual walers are to be applied to the outside portionsof the brackets 50, the arrangement shown in FIGS. 12 and 13 may beemployed although it is within the purview of the present invention toemploy other conventional waler clamping means if desired.

7 The upper and lower walers 120 and 122 respectively are clamped hardagainst the crest of the bight portion 56 by means of a clamping plate124 of shallow U-shape in ltransverse cross section. A short tie rod 126passes through a hole 128 provided in the web portion of the plate 124,as well as through the slot 64 in the bight portion 56 of the bracket56, and has its outer looped end 130 projecting outwardly beyond theouter face of the plate 124 for reception therethrough of a Wedge 132.The inner looped end 134 of the tie rod 126 passes around the shankportion 136 of a T-bolt 138 which extends through the aligned slo'ts 66,and which is secured by means of a wedge 140 which is driven through thewedge shank portion 136 and -bears against the bracket side 58.

There have been described above three contemplated environments for theimproved extension bracket 50 of the present invention but it is to bedistinctly understood that other environments are contemplated. Theinvention therefore is not to be limited to the exact arrangement ofparts shown and described in connection with these environments, nor isit to be limited to the specific configuration of the bracket 50illustrated herein. Various changes in the details of construction ofthe bracket 50 may be resorted to without departing from the spirit ofthe invention. Only insofar as the invention has particularly beenpointed out in the accompanying claims is the same to be limited.

Having thus described the invention what I claim as new and desire tosecure by Letters Patent is:

l. In a concrete wall form structure, in combination, a pair of alignedprefabricated panel units spaced laterally from each other and embodyingopposed marginal vertical metal frame bars and plywood panel facings,there being an elongated slot in each of said opposed marginal framebars at substantially the same height in the form wall, a horizontallydisposed extension bracket extending between said opposed frame bars,said extension bracket comprising an elongated metal stamping ofgenerally U-shape cross section and presenting spaced apart sidesconnected Itogether by a bight portion, Ithe free edge side marginalportions of said sides being turned laterally outwardly away from eachother to provide a pair of coplanar attachment flanges, said sides beingformed in the opposite end regions of the bracket with respective pairsof transversely aligned slots, a T-bolt projecting through each of saidelongated slots in the frame bars and having a shank portion enteringbetween the sides of the bracket, said shank portion being provided witha transverse slot therethrough, a wedge' member projecting through eachpair of transversely aligned slots and through the slot in the adjacentT-bolt shank for clamping the adjacent end of the bracket against theadjacent frame bar, there being a series of nail holes in each of saidattachment flanges, a form extension board bridging the distance betweensaid opposed frame bars and having an inside face substantially ush withthe inside faces of the panel unit facings, and a series of attachmentnails extending through said nail holes and into said board.

2. In a concrete wall form structure, the combination set forth in claim1 and wherein the sides of said bracket are substantially flat and areslightly divergent and the bight portion of the bracket is arcuate intransverse cross section.

3. In a concrete wall form structure, in combination, a pair of alignedprefabricated panel units spaced laterally from each other and embodyingopposed marginal vertical metal frame bars and plywood facings, each ofsaid opposed marginal frame bars being generally channel-shape in crosssection and embodying a pair of inner and outer marginal ribsrespectively and a connecting at web, there being an elongated slot insaid web intermediate said ribs with the two slots in the frame barsbeing disposed in substantially the same horizontal plane, ahorizontally disposed extension bracket extending between the opposedmarginal frame bars and having its ends anchored to the webs thereofrespectively, said extension bracket comprising an elongated metalstamping of generally U-shape cross section and presenting spaced apartsides connected together by a bight portion, the free side marginalportions of said sides being turned laterally outwardly away from eachother to provide a pair of coplanar attachment flanges, said sides beingformed in the opposite end regions of the bracket with respective pairsof transversely aligned slots, a T-bolt projecting through each of saidpairs of elongated slots in the frame bars and having a shank portionentering between the sides of the bracket, said shank portion beingprovided with a transverse slot therethrough, a Wedge member projectingthrough each pair of transversely aligned slots and through the slot inthe adjacent T-bolt shank for clamping the adjacent end of the bracketagainst the adjacent frame bar with the bight portion of the bracketoverlying the outer marginal rib of said frame bar, the end region oreach bight portion at each end of the bracket being formed with aclearance notch therein to clear the outer marginal rib of the adjacentframe bar, there being a series of nail holes in each of said attachmenttlanges, a form extension board bridging the distance between saidopposed frame bars and having an inside face substantially liush withthe inside faces of the panel unit facings, and a series of attachmentnails extending through said nail holes and secured in said board.

4. In a concrete wall form structure, the combination set forth in claim3 and wherein the sides of the bracket are substantially at and areslightly divergent and the bight portion of the bracket is arcuate intransverse cross section.

5. In a concrete wall form structure, in combination, an opstandingprefabrcated panel unit adapted with similar units in coplanar relationto form one side of the structure and embodying a rectangular facing anda rectangular reinforcing frame connected to and extending around themargin of the facing and embodying vertical and horizontal frame bars,there being an elongated slot in one of the bars of the reinforcingframe, an ertension bracket extending at right angles to and outwardsfrom the one frame bar and having its inner end abutting against theslot-equipped portion of said one frame bar,- said extension bracketcomprising an elongated metal stamping of generally U-shaped crosssection consisting of spaced apart sides connected together by a bightportion, the free marginal portions of said sides being turned laterallyoutwardly -away from each other to provide a pair of coplanar attachmentflanges, said sides being provided in the end portions thereof that arenearer said one frame bar with a pair of transversely aligned slots, aT-bolt projecting through the elongated slot in said one frame bar andhaving a shank portion entering between the adjacent end portions of thesides of the bracket, said shank portion being provided with atransverse slot therethrough, a wedge member projecting through the pairof transversely aligned slots in the sides of the bracket and throughthe slot in the shank of the T-bolt and serving to clamp the inner endof the bracket against said one frame bar, there being a series of nailholes in each of said attachment flanges, a form extension boarddisposed in coplanar relation with the facing of (References onfollowing page) References Cited in the le of this patent UNITED STATESPATENTS Trester Nov. 3, 1925 Miller Sept. 10, 1929 Fischer July 14, 1931Wales May 2, 1933 Roberg Feb. 27, 1934 Harrington Nov. 29, 1938 10Symons June 2, 1953 Banneyer Nov. 9, 1954 Symons Dec. 17, 1957 PaxtonIuly 21, 1959 Imonetti Aug. 9, 1960 OTHER REFERENCES Symons Catalog M-7,pages 9 and 10, Symons Clamp & Mfg. Co., Chicago 39, Ill.

